g3statsd: add initial code structure

[zh-jq]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 112 lines in your changes missing coverage. Please review.

Project coverage is 55.07%. Comparing base (25a0518) to head (35a8c55).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
g3statsd/src/opts.rs	0.00%	48 Missing ⚠️
g3statsd/src/main.rs	0.00%	37 Missing ⚠️
g3statsd/src/config/mod.rs	0.00%	16 Missing ⚠️
g3statsd/src/build.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #590      +/-   ##
==========================================
- Coverage   55.14%   55.07%   -0.08%     
==========================================
  Files        1182     1186       +4     
  Lines      109299   109411     +112     
==========================================
- Hits        60276    60259      -17     
- Misses      49023    49152     +129     

Flag	Coverage Δ
g3bench	32.83% <0.00%> (-0.07%)	⬇️
g3proxy	53.93% <0.00%> (-0.08%)	⬇️
lib	24.94% <0.00%> (-0.06%)	⬇️

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